Tony is a lawyer now, but he in a delivery pany for six years.
A. has served
B. had served
C. was serving
D. served
网友回答
A. has served
B. had served
C. was serving
(答案→)D. served
解析：句意：现在Tony是个律师了，但是此前他在一家快递公司干了六年。A. has served现在完成时；B. had served过去完成时；C. was serving过去进行时；D．served一般过去时。一般过去时过去的动作或状态，也可以表示过去一段时间的动作或状态。故选D。
考点: 考查动词时态的用法。